CN102317586B - Method for monitoring oxidation catalyst in exhaust pipeline of internal combustion engine - Google Patents
Method for monitoring oxidation catalyst in exhaust pipeline of internal combustion engine Download PDFInfo
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- CN102317586B CN102317586B CN2010800067571A CN201080006757A CN102317586B CN 102317586 B CN102317586 B CN 102317586B CN 2010800067571 A CN2010800067571 A CN 2010800067571A CN 201080006757 A CN201080006757 A CN 201080006757A CN 102317586 B CN102317586 B CN 102317586B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
- F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
- F01N2430/085—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing at least a part of the injection taking place during expansion or exhaust stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
There is presented a method for monitoring an oxidation catalyst in an exhaust line of an internal combustion engine, wherein a catalyst diagnostic event comprises a test cycle during which a conversion capability of the oxidation catalyst is determined based on the exotherm generated by post-injection of fuel. The diagnostic event may only be initiated when the temperature of the oxidation catalyst lies within a predetermined temperature range.
Description
Technical field
Present invention relates in general to On-Board Diagnostics (OBD), and relate more specifically to the method for the performance of the oxidation catalyst of monitoring the I. C. engine exhaust pipeline.
Background technique
Now, catalyst is that conventional feature on the vent systems of motor vehicle is with the purifying engine exhaust.In diesel engine for example, the most frequently used catalyst is diesel oxidation catalyst (DOC), usually is connected with diesel particulate filter (DPF).Its major function is that the hydrocarbon in exhaust stream (HC) is converted into water (H
2O) and carbon dioxide (CO
2).These transducers reach 90% efficient usually, have in fact eliminated diesel odor and have helped to reduce visible particle (soot).
Need to increasing along with the pollution control regulation of many national increasingly stringents of catalyst (especially on motor vehicle).And in Europe V on the horizon and VI regulation, the On-Board Diagnostics (OBD) of DOC becomes enforceable for the vehicle of large quantity.This diagnosis comprises the performance (that is, conversion efficiency) of determining catalyzer, to detect whether purifying exhaust gas or whether it excessively old/damaged and should changing according to the rules still of catalyzer.
In fact, through long-time, in other words in the situation that motor vehicle engine through the average mileage of 100000 km magnitudes or the average operating time of 1000 hours magnitudes, the stable performance ground of catalyst conversion pollutant descends.This process is called " aging " and it is caused by manifold physical and chemical factor factor, in any case process carefully catalyst, this is all inevitable.Ageing process depends on the strain that catalyst exposes to a great extent in its typical operation.Another phenomenon that may change the conversion efficiency of catalyst is " poisoning ", for example, and when using low grade fuel.
According to using and fixed aging, in fact can not make the macro-forecast about the catalyst serviceability due to catalyst this.In addition, the overall direction (if any) of service time length or mileage (catalyst will be changed after this) must be strict especially, in order to prevent from continuing to use invalid catalyst.But obviously meaning for the purpose of preventing, this changes still obviously available catalyst.
Thereby remedying of this situation is the functional performance of each catalyst of monitoring, and it is carried out in long-time and is reliable.
In diesel engine, the On-Board Diagnostics (OBD) of DOC is usually based on the thermal discharge that is produced by rear injection (that is, burner oil during exhaust stroke).Rear injection has increased the amount of not firing HC in the exhaust stream, and it will be converted to water and CO in DOC
2This conversion relates to exothermic oxidation reaction, and it produces the heat with the front concentration of DOC (that is, entering the HC amount of DOC) direct correlation.As is known to persons skilled in the art, this thermal discharge generates the regeneration that is used for diesel particulate filter (DPF), gathers soot to increase delivery temperature in order to burn.
Therefore, the DOC diagnosis in diesel engine is carried out during the regeneration mode of DPF usually, this means the combustion mode with rear injection.The typical conversion efficiency diagnosis comprises the thermal discharge that compares to monitor DOC by the delivery temperature with the DOC front and rear, thereby sprays the exhaust increase that in fact whether to cause the DOC downstream after checking.Carry out diagnosis and guarantee that also DOC is in relatively high temperature during the dpf regeneration pattern, because in order to start conversion, need the minimum temperature of DOC.
Summary of the invention
The purpose of this invention is to provide a kind of replacing method of monitoring oxidation catalyst, it allows the reliable long term monitoring of catalyzer conversion efficiency.
The present invention is based on following observation: when carrying out the diagnosis of catalyst, there is the risk of false assessment in (usually like this during regeneration event) in the high temperature range of catalyst.Its reason is because (highly) aging catalyst still has good efficient and low in the lower temperature range internal efficiency of emission testing circulation in high temperature range.Thereby the regeneration event with high DOC temperature and/or motor discharge exhaust high temperature can not be used for diagnosing safely DOC.
These defectives overcome by the method according to this invention.
The present invention relates to the method for the oxidation catalyst of monitoring I. C. engine exhaust pipeline, wherein, the catalyzer diagnostic event comprises test cycle, and during test cycle, the thermal discharge that the conversion performance of oxidation catalyst is penetrated generation based on post fuel injection is determined.According to importance of the present invention, diagnostic event can only start when the temperature of oxidation catalyst is positioned at predetermined temperature range.
In addition, test cycle comprises rear injection events and thermal discharge monitoring period of time, and after rear injection events, the thermal discharge monitoring period of time continues, until all heats basically of storing in oxidation catalyst are emptying.
Predetermined temperature range is advantageously selected can distinguish new or slightly aging catalyzer and aging catalyst, thereby the conversion efficiency that should cover expection height aging catalyst will be starkly lower than the temperature range of the conversion efficiency of the newer catalyzer that works (that is, operation satisfactorily).
So, when being reduced to the conversion efficiency alarm threshold value under conversion efficiency, but the trigger alarm signal.
In one embodiment, predetermined temperature range is selected with corresponding with the transition region of the conversion efficiency with given aging reference oxidation catalyst.In other words, predetermined temperature range preferably selected with the conversion efficiency with selected aging reference oxidation catalyst less than 100% and more preferably to have the temperature range of the conversion efficiency that is starkly lower than the aging less oxidation catalyst that works corresponding.Will be appreciated that the conversion efficiency value under different temperatures is by Experimental Calibration and definite with reference to oxidation catalyst.
More preferably, the temperature upper limit of predetermined temperature range with aging with reference to oxidation catalyst to be no more than 90% conversion efficiency corresponding.
In a preferred embodiment, predetermined temperature range is selected such that its lowest temperature is corresponding with aging about conversion efficiency of 40% to 80% with reference to oxidation catalyst respectively with the upper limit, more preferably 40% to 60%.
Preferably, the further standard of the lowest temperature of predetermined temperature range is that it should be corresponding with the intended conversion efficient of the oxidation catalyst that works (having given aging) at least, preferably at least 50%.
Will be appreciated that advantageously execution when motor does not operate with the dpf regeneration pattern of diagnostic event of the present invention.
In order to increase the accuracy of diagnostic event, in the situation that leaving predetermined temperature range, the temperature of oxidation catalyst cancels diagnostic event.If occur during rear injection events, this is especially true.
And in order to improve accuracy, the oxidation catalyst temperature can be by means of many section model monitorings, and can only trigger and/or carry out diagnostic event when the relevant temperature of all described sections all is positioned at predetermined temperature range.
In addition, diagnosing cycle period, engine parameter can advantageously be set so that the HC amount in the exhaust that motor is discharged except rear injection minimizes.
According to an embodiment, determine to measure thermal discharge by monitoring the delivery temperature of leaving oxidation catalyst preset time after rear injection in section.
Description of drawings
Referring now to accompanying drawing, the present invention is described by way of example, in the accompanying drawings:
Fig. 1 shows the plotted curve of aging impact on catalyst efficiency;
Fig. 2 shows and measures the delivery temperature (T that DOC discharges
out) and there is no the situation drag delivery temperature (T of rear injection
Out-mod) plotted curve.
Embodiment
Referring now to the preferred embodiment elaboration the present invention who is applied to diesel oxidation catalyst (DOC) field.
As is known to persons skilled in the art, usually visible DOC now in the vent systems of diesel car.DOC is arranged on the upstream of diesel particulate filter (DPF) usually, is used for auxiliary its regeneration.In fact, in order to eliminate the carbon soot particles of collecting in DPF, conventional method is by increasing delivery temperature to regulate combustion mode operation motor, comprising that separate (1) and delay fuel sprays; (2) carry out rear the injection to increase and fire the HC amount in exhaust.Do not fire HC experience DOC exothermic oxidation reaction and be converted into water and carbon dioxide.
As mentioned above, the conversion performance of expectation monitoring DOC.Conventional DOC diagnosis is carried out during the dpf regeneration event and based on the DOC exothermic heat that is caused by rear injection.Guarantee that higher than starting the required minimum temperature of catalyst material, there is the risk of false assessment in the DOC temperature although carry out the DOC diagnostic event during regeneration event.
This problem can be understood better from Fig. 1, and Fig. 1 shows aging impact on DOC, and the HC conversion efficiency is drawn with respect to the DOC temperature.Can find out, aging catalyst still can have good efficient in high temperature range (for example, for many DOC usually above 300 ℃).Yet highly aging catalyzer obviously has relatively poor or unacceptable conversion efficiency under lower temperature (for example, lower than 250 ℃).
(that is, reliable long term monitoring DOC), the inventive method propose to carry out the DOC diagnostic event under lower or mild temperature, at this temperature, in fact can assess the ageing state of DOC rather than whether it breaks simply in order to ensure catalyst.In the situation that aging behavior shown in Figure 1, the temperature window that can form diagnostic event according to the present invention is for example 150 to 200 ℃.
Thereby diagnostic event is preferably carried out in normal engine operation (normal combustion mode, for example lean-burn) rather than when being in the dpf regeneration pattern, and the dpf regeneration pattern causes high-temperature exhaust air and thereby makes DOC be in high temperature range.
The DOC temperature is preferably according to many section model monitorings, that is, in fact DOC is divided into the temperature that a plurality of sections and algorithm are used for determining based on one or more measured temperatures of DOC each section.
In the methods of the invention, oxidation catalyst diagnostic event thereby carry out when DOC is in the predetermined temperature window, as mentioned above.For the catalyzer of given model and type, this temperature window will be usually based on demarcation such as experimental test, simulation, forced aging tests.
Diagnostic event comprises following test cycle.Specify in window and motor during with dpf regeneration pattern or other dense combustion mode operation checking that the DOC temperature is in, carry out the rear injection of metering fuel amount.As used herein, term " then spray " refers to and injects fuel in cylinder when burning occuring not or time of burning seldom occurs or in exhaust duct before DOC.Carry out when after in cylinder, injection can finish towards expansion stroke usually (or more late).Yet, to compare with the rear injection of usually carrying out in the dpf regeneration pattern, the fuel quantity that sprays in rear injection pulse is relatively still less.In fact, purpose is not to make DOC in fact be in high temperature range, but monitors rear result of spraying and check whether it causes expecting thermal discharge.Thereby a small amount of rear fuel (for example, some grams) is injected to produce interim heat release in DOC usually.
One carries out rear the injection, and the heat that is produced by DOC just gathers (algorithm of considering to implement test cycle).This is preferably undertaken by the delivery temperature that measurement DOC outlet (or its downstream) is located.When all heats in being stored in DOC had been emptied in exhaust, heat accumulation stopped and comparing with theoretical heat that rear fuel should produce.Then, conversion efficiency is calculated as the ratio that gathers the theoretical heat that heat and rear fuel should produce.
In order to assess thermal discharge, we consider to leave the instantaneous total heat energy of exhaust of DOC corresponding to the summation of heat energy with the heat energy that is caused by the thermal discharge relevant with amount of fuel injected of the exhaust that enters DOC, yet the item by the expression transition is proofreaied and correct, and namely considers the thermal inertia of DOC.The instantaneous thermal energy balance of this of DOC can be expressed as follows:
Wherein,
T in The delivery temperature of expression DOC ingress;
T out The delivery temperature in expression DOC outlet port;
ηIt is the DOC conversion efficiency;
MThe expression exhaust mass flow;
CpThe thermal capacity of expression exhaust;
q f The fuel quantity of introducing exhaust is sprayed in expression by rear fuel;
Q DOC_stored The heat energy that is stored in the DOC material;
HIt is fuel value.
When in the timesharing of certain hour section t inner product, relation (1) is equivalent to:
Wherein
T Out-mod The model DOC of expression 'inertia' DOC discharges delivery temperature, that is, spray after not carrying out and thereby when usually there is no heat release.It may be noted that in this mathematical method,
T Out-mod Be equivalent to after stablizing
T in q f HCorresponding to theoretical thermal discharge.
The principle of this integration is shown in Figure 2, wherein, measures delivery temperature T
outWith the situation drag delivery temperature T that there is no rear injection
Out-modDraw with respect to the time.Integration begins together with rear injection pulse and is performed until all heats that gather in DOC are discharged from.
Thereby, in the methods of the invention, test cycle begins by means of injection pulse/event after a small amount of, and comprises the thermal discharge monitoring period of time, during the thermal discharge monitoring period of time, monitored and lasting until all heats basically that are stored in catalyzer due to rear injection of thermal discharge are drained.Preferably, the thermal discharge monitoring period of time is injection events and begin and continue after rear injection events subsequently, until emptying all heats.Usually, the heat in monitoring catalyst means the delivery temperature (T that measures the DOC outlet
out), and heat accumulation (integration) is so that definite heat (that is, thermal discharge) that is in fact produced by rear injection events.Can be by the delivery temperature T with the DOC outlet thereby monitoring period of time finishes to discharge with the heat that causes due to heat release
outDelivery temperature T with model DOC discharge
Out-modCompare to determine.T is on duty
out-T
Out-modUnder when being reduced to predetermined threshold, can infer that emptying and monitoring of heat can stop.In other words, at T
outAnd T
Out-modIn the time of about equally, monitoring period of time finishes.
Alternatively, can expire to indicate the thermal discharge monitoring period of time to finish by demarcating timing.This timing can have known (according to test/test) greater than emptying thermal discharge (sprayed by known rear fuel and the cause) endurance of required time.
Those skilled in the art are clear, and rear injection events shown in Figure 2 can be continuous impulse in being directly injected to exhaust line the time, but will be corresponding with a plurality of additional fuel amounts in being ejected into cylinder the time.
For exemplary purpose, and should not be construed as restrictively, consider and spraying fuel quantity after 1 to 15g during 1 to 20s period and be suitable for carrying out the present invention's diagnosis of current most of type oxidation catalysts for motor vehicle.By means of this post-injection fuel, expection thermal discharge monitoring period of time will continue between 1 and 10 minute.
For the accurate result of efficient is provided, enter DOC accurate fuel quantity (
q f ) must be known, thereby accurately measured.In order to improve accuracy, the rear fuel that sprays preferably uses for example can be demarcated temperature and the extraction flow that correction factor discharges for motor and proofread and correct.
Equally, noise for fear of the HC amount of discharging due to motor (not being to be introduced by rear injection) causes is equipped with to allow the EGR(exhaust gas recirculatioon of intake manifold is got back in a part of recirculation of exhaust) EGR of the automobile of valve leads and preferably be reduced to predetermined value during diagnostic event.Equally, for the endurance of diagnostic event, any other parameter (for example, the eddy current in the firing chamber) that may affect the HC concentration of motor discharge is preferably set to the minimized predetermined value of HC that makes motor discharge.
Still it should be noted that the common oxidation catalysts technology based on zeolite, it has obvious HC storage effect under low temperature (common＜250 ℃).The unknown of HC is gathered in the DOC before diagnostic event, in the situation that DOC when surpassing predetermined amount of time lower than the predetermined temperature threshold operation, prevents that diagnostic event from beginning.If motor is idle a moment, this usually may be so.When observing the DOC temperature and increased higher than temperature threshold, can begin diagnostic event subsequently, suppose and satisfy other required condition.
In addition, for DOC performance monitoring reliably, if the DOC temperature is left the diagnosis temperature window, preferably cancel diagnostic event.Particularly, if the DOC temperature is left the diagnosis temperature window during the rear injection events of carrying out test cycle.In this respect, it may be noted that because rear injection is relatively short, thus the DOC temperature leave the diagnosis temperature window probability low.
It is to be further understood that, owing to only using short rear injection events (thereby with the fuel quantity that sprays after usually compare fuel quantity few) in regeneration mode in test cycle, thereby the thermal discharge that produces can not make DOC overheated usually, namely causes its temperature outside diagnostic window.
More specifically with reference to the selection of diagnosis temperature window, idea is to diagnose in such DOC temperature window now, and wherein, aging (that is, highly aging) catalyzer can not be evaluated as aging less catalyzer.In practice, this means based on determine the limit of diagnosis temperature window with height aging catalyst (with reference to oxidation catalyst) for referencial use.The upper limit of window should be selected with reference catalyst lower than 100%(preferably lower than 90%) conversion efficiency corresponding.In the example of Fig. 1, this means to be limited to 200 ℃ on time window.As mentioned before, lower limit can be 150 ℃, and this is the temperature that allows conversion, but very low.Selecting the additional standard of lower limit can be that temperature is enough to reach firing point for the oxidation catalyst that works (for example, the slightly aging catalyzer of Fig. 1), that is, and and 50% conversion efficiency (in the situation that this paper is 150 ℃).
In optional preferred embodiment, the conversion efficiency that the diagnosis temperature window can be selected in 40% to 60% scope with the reference altitude aging catalyst is corresponding.This is applied to Fig. 1, can releases from the curve of height aging catalyst (reference), corresponding diagnosis temperature window is 170 ℃ to 185 ℃.Can find out, this temperature range is corresponding with the steep transition region of the conversion efficiency of this reference (highly aging) catalyzer.It is obviously away from the conversion efficiency curve of aging catalyst slightly.
Still with reference to the example of figure 1, if determined conversion efficiency is lower than 40% in this predetermined diagnosis temperature window (170-185 ℃), infer that so oxidation catalyst need to change and produce alarm signal.
The particular device (for most of engine/vehicle) that the inventive method can easily be implemented and not need to add in the ECU of internal-combustion engine.
Claims (17)
1. method that is used for the oxidation catalyst of monitoring I. C. engine exhaust pipeline, wherein, the catalyzer diagnostic event comprises test cycle, during test cycle, the thermal discharge that the conversion performance of described oxidation catalyst is penetrated generation based on post fuel injection determines,
Wherein
Described diagnostic event can only start when the temperature of described oxidation catalyst is positioned at predetermined temperature range,
It is characterized in that, described test cycle comprises rear injection events and thermal discharge monitoring period of time, and after described rear injection events, the thermal discharge monitoring period of time continues, until all heats of storing in described oxidation catalyst are emptying.
2. method according to claim 1, wherein, described thermal discharge is assessed by measuring the delivery temperature of leaving described oxidation catalyst during described thermal discharge monitoring period of time.
3. method according to claim 2, wherein, described oxidation catalyst has outlet, and wherein, as the delivery temperature (T of catalyst outlet
out) and the delivery temperature (T that discharges of model catalyst
Out-mod) when equating, described thermal discharge monitoring period of time finishes.
4. method according to claim 2, wherein, as the delivery temperature (T of catalyst outlet
out) delivery temperature (T that discharges with model catalyst
Out-mod) between difference under when being reduced to predetermined threshold, described thermal discharge monitoring period of time finishes.
5. method according to claim 2 wherein, is being demarcated timing when expiring, and described thermal discharge monitoring period of time finishes.
6. any one described method according to claim 1 to 5, wherein, described predetermined temperature range is selected with corresponding with the transition region of the conversion efficiency with given aging reference oxidation catalyst.
7. any one described method according to claim 1 to 5, wherein, described predetermined temperature range is selected, make temperature upper limit with aging with reference to oxidation catalyst to be no more than 90% conversion efficiency corresponding.
8. any one described method according to claim 1 to 5, wherein, described predetermined temperature range is selected, makes lowest temperature and the upper limit corresponding with aging 40% and 80% conversion efficiency with reference to oxidation catalyst respectively.
9. any one described method according to claim 1 to 5, wherein, described predetermined temperature range has lowest temperature and the upper limit, and described lowest temperature and the upper limit are selected with corresponding with aging 40% and 60% conversion efficiency with reference to oxidation catalyst respectively.
10. any one described method according to claim 1 to 5, wherein, the lowest temperature of described predetermined temperature range is selected with corresponding with the intended conversion efficient of the reference oxidation catalyst that works at least.
11. method according to claim 10, wherein, described intended conversion efficient is at least 50%.
12. method according to claim 1, wherein, described diagnostic event is carried out when motor does not operate with the dpf regeneration pattern.
13. method according to claim 1 wherein, in the situation that the temperature of described oxidation catalyst is left described predetermined temperature range, is cancelled described diagnostic event.
14. method according to claim 1 wherein, during carrying out described rear injection events, in the situation that the temperature of described oxidation catalyst is left described predetermined temperature range, is cancelled described diagnostic event.
15. method according to claim 1, wherein, the oxidation catalyst temperature is by means of many section model monitorings, and only can trigger and/or carry out described diagnostic event when the relevant temperature of all described sections all is positioned at described predetermined temperature range.
16. method according to claim 1, wherein, in described diagnosis cycle period, engine parameter is set so that the HC amount in the exhaust that motor is discharged except rear injection minimizes.
17. method according to claim 1, wherein, when being reduced to the conversion efficiency alarm threshold value under conversion efficiency, the trigger alarm signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP09152180.7 | 2009-02-05 | ||
| EP09152180A EP2216522A1 (en) | 2009-02-05 | 2009-02-05 | On-board vehicle diagnostic of an oxidation catalyst |
| PCT/EP2010/051420 WO2010089370A1 (en) | 2009-02-05 | 2010-02-05 | On-board vehicle diagnostic of an oxidation catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102317586A CN102317586A (en) | 2012-01-11 |
| CN102317586B true CN102317586B (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800067571A Active CN102317586B (en) | 2009-02-05 | 2010-02-05 | Method for monitoring oxidation catalyst in exhaust pipeline of internal combustion engine |
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| Country | Link |
|---|---|
| US (1) | US20110296816A1 (en) |
| EP (2) | EP2216522A1 (en) |
| JP (1) | JP2012516971A (en) |
| CN (1) | CN102317586B (en) |
| WO (1) | WO2010089370A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102008049098A1 (en) * | 2008-09-26 | 2009-06-25 | Daimler Ag | Exhaust-gas cleaning system operating method for e.g. diesel engine of motor vehicle, involves determining aging condition of exhaust gas cleaning component by correlation of hydrocarbon existed in exhaust gas upstream of component |
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| JP5862497B2 (en) * | 2012-07-17 | 2016-02-16 | トヨタ自動車株式会社 | Catalyst deterioration judgment device |
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| CN112855319B (en) * | 2021-02-08 | 2022-05-17 | 一汽解放汽车有限公司 | Urea double-nozzle injection control method and exhaust gas aftertreatment system |
| US11946400B2 (en) * | 2021-10-19 | 2024-04-02 | Paccar Inc | System and method for monitoring an oxidation catalyst |
| CN114183225B (en) * | 2021-11-23 | 2022-10-25 | 潍柴动力股份有限公司 | Exhaust pipe temperature drop detection method and device |
| DE102022201686A1 (en) * | 2022-02-18 | 2023-08-24 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method, computing unit and computer program for determining a quantity of hydrocarbons in an exhaust gas of a lean-burn internal combustion engine |
| CN114961951B (en) * | 2022-05-10 | 2023-12-15 | 潍柴动力股份有限公司 | Active monitoring method, device and system for DOC sulfur poisoning |
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- 2010-02-05 JP JP2011548692A patent/JP2012516971A/en active Pending
- 2010-02-05 WO PCT/EP2010/051420 patent/WO2010089370A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2216522A1 (en) | 2010-08-11 |
| US20110296816A1 (en) | 2011-12-08 |
| JP2012516971A (en) | 2012-07-26 |
| EP2394034A1 (en) | 2011-12-14 |
| WO2010089370A1 (en) | 2010-08-12 |
| CN102317586A (en) | 2012-01-11 |
| EP2394034B1 (en) | 2012-12-26 |
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